The Spitfire has been designed as a compact portable or mobile RF linear Amplifier capable of operating at 1000 watts PEP input SSB. Features In this new compact design permit ease of operation and compatabillty with the many Transceiver nov on the market. When used with the DC to DC Power Supply model PS-1000B, the unit becomes a kilowatt mobile lieear Amplifier When used with the model PS-1000 A.C Power Supply the LA-600H becomes a compact table top SSB kilowatt Amplifier No internal changes are required 'when going from the AC to DC power supplies; thus the unit may be quickly removed from the vehicle for base station operation* DESCRIPTION The Spitfire utilizes six Inexpensive type 12JB6 Tubes high mu-trlode connected, in grounded grid circuitry. A 70 ohm pad is provided across the input to present a more constant load Impedance to the exciter. The pi-network features pre-set Antenna loading for each band 80 through 10 meters, permitting simplified tuning of the Amplifier Relay switching functions are provided'to connect the exciter to the Amplifier input; and the Amplifier output to the Antenna when transmitting; and to connect the Antenna back to the exciter or Transceiver while receiving. This relay can be actuated by the VOX circuit in the exciter used* This eliminates the need for two coaxial relays normally required when a Transceiver Is used with an Amplifier The aircraft type post light is used for meter illumination and as a Pilot Radio and Tube Corporation light. Since the unit was designed for continuous handling, the cabinet and handle are chrome plated to retain their appearance. The radical departure from conventional construction permits free air convection- cooling of the Components and Amplifier Tubes thus eliminating the necessity of a cooling fan. The 1/8 inch aluminum support plate for the Tubes erves as a heat sink, keeping the base seal temperatures low. A zener diode in the DC cathode path provides Amplifier bias. Bias generated In this fashion is ripple free and stable under the variable loads imposed by SSB type of operation. The 1/8 inch aluminum rear panel serves as a heat sink for the zener diode.